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參數(shù)資料
| 型號： | DS1747W-120IND |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC RAM Y2K 3.3V 120NS 32EDIP |
| 標(biāo)準(zhǔn)包裝： | 11 |
| 類型： | 時鐘/日歷 |
| 特點： | 閏年，NVSRAM，Y2K |
| 存儲容量： | 512KB |
| 時間格式： | HH:MM:SS（24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 2.97 V ~ 3.63 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 32-DIP 模塊（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 32-EDIP |
| 包裝： | 管件 |
DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs
6 of 16
electrical environment also affects the clock accuracy, and caution should be taken to place the RTC in
the lowest-level EMI section of the PC board layout. For additional information, refer to Application
Note 58.
CLOCK ACCURACY (PowerCap MODULE)
The DS1747 and DS9034PCX are each individually tested for accuracy. Once mounted together, the
module typically keeps time accuracy to within ±1.53 minutes per month (35 ppm) at +25°C. Clock
accuracy is also affected by the electrical environment and caution should be taken to place the RTC in
the lowest-level EMI section of the PC board layout. For additional information, refer to Application
Note 58.
Table 2. Register Map
ADDRESS
DATA
FUNCTION RANGE
B7
B6
B5
B4
B3
B2
B1
B0
7FFFF
10 Year
Year
00-99
7FFFE
X
10 Month
Month
01-12
7FFFD
X
10 Date
Date
01-31
7FFFC
BF
FT
X
Day
01-07
7FFFB
X
10 Hour
Hour
00-23
7FFFA
X
10 Minutes
Minutes
00-59
7FFF9
OSC
10 Seconds
Seconds
00-59
7FFF8
W
R
10 Century
Century
00-39
OSC
= Stop Bit
R = Read Bit
FT = Frequency Test
W = Write Bit
X = See Note
BF = Battery Flag
Note: All indicated “X” bits are unused, but must be set to “0” during write cycles to ensure proper clock operation.
RETRIEVING DATA FROM RAM OR CLOCK
The DS1747 is in the read mode whenever OE (output enable) is low, WE (write enable) is high, and CE
(chip enable) is low. The device architecture allows ripple-through access to any of the address locations
in the NV SRAM. Valid data will be available at the DQ pins within tAA after the last address input is
stable, providing that the CE and OE access times and states are satisfied. If CE or OE access times and
states are not met, valid data will be available at the latter of chip-enable access (tCEA) or at output enable
access time (tOEA). The state of the data input/output pins (DQ) is controlled by CE and OE. If the
outputs are activated before tAA, the data lines are driven to an intermediate state until tAA. If the address
inputs are changed while CE and OE remain valid, output data will remain valid for output data hold
time (tOH) but will then go indeterminate until the next address access.
WRITING DATA TO RAM OR CLOCK
The DS1747 is in the write mode whenever WE, and CE are in their active state. The start of a write is
referenced to the latter occurring transition of WE or CE. The addresses must be held valid throughout
the cycle. CE or WE must return inactive for a minimum of tWR prior to the initiation of another read or
write cycle. Data in must be valid tDS prior to the end of write and remain valid for tDH afterward. In a
typical application, the OE signal will be high during a write cycle. However, OE can be active provided
that care is taken with the data bus to avoid bus contention. If OE is low prior to WE transitioning low
the data bus can become active with read data defined by the address inputs. A low transition on WE
will then disable the output tWEZ after WE goes active.
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| DS1747W-120IND+ | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1747WP-120 | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1747WP-120+ | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1747WP-120IND | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1747WP-120IND+ | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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